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Aquisition (narrative) (detail) (USD $)
Apr. 01, 2014
Business Acquisition, Cost of Acquired Entity, Purchase Price [Abstract]  
Equity Method Investments $ 16,308,000us-gaap_EquityMethodInvestments
Equity Ownership Percentage 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
Equiity Investment Right to Acquire Percentage 50.00%senea_EquiityInvestmentRightToAcquirePercentage